Originally Posted by BlahBlahYouToo
it's not actually muscular fatigue that's holding me back.
it's my heart and lungs that are taking minutes to recover. yeah I know, my cardio sucks.
Technically, the reason you feel it so much in your lungs is because your muscles aren't efficient at what they do. In human physiology, healthy lungs are not the limited factor with activity (except in the most elite of athletes). If your muscles aren't trained well, they don't utilize oxidative pathways well. Instead, they use less efficient glycolytic (aerobic and anaerobic) pathways, which produce more CO2. Because of that, your lungs must let off more CO2 and buffer the acidity. That's why it feels like your lungs are the limiting factor, but in reality they just feel like crap because your muscles aren't as efficient as they could be. Need to work on endurance of those muscle groups that affect you the most if this is a problem you want to fix.
Related to health and fitness, the suggestions I give are opinions and not professional claims. However, I will hypothesize the best I can to be of some help. Keep this in mind when reading the above post.
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